I re-learned some electrical terms today that may be useful later when working with GFCI circuits.

• Line (usually black, also known as “hot”): comes in from the electrical panel
• Load (usually black, sometimes red): is a continuation of line and goes out to downstream devices. Non-GFCI circuits will not have a load.
• Neutral (usually white): completes the AC circuit and carries excess current to ground
• Ground (bare): carries any inadvertent current away from the circuit in case of a fault

The catchphrase is “line in, load out”.

scroll mode

tmux has a scroll mode where you can use page up/page down and arrows to scroll the buffer back. To enter scroll mode, C-b <page up>. To get out of scroll mode, <Esc>. Also C-b [ turns on scroll mode.

sharing

Poor man’s screen sharing:

$ tmux -S /tmp/tmux-shared new-session -s session-name
(detach)
$ chmod 777 /tmp/tmux-shared
(attach)

Person 2 attaches:

$ tmux -S /tmp/tmux-shared attach-session -s session-name

Here are a few notes I’ve made when using LaTeX:

Hyphens

For two literal hyphens, separate them with {}, for example:

The \texttt{-{}-delete} flag should be set.

Underscores

Underscores are special; escape them if you want to use them literally:

Check the \texttt{authorized\_keys} file.

Some notes about git. As with all my technical posts, some or all of this may be out of date. Consider it, then, courage to believe that there may be a solution to your problem in terms you can understand.

I have a local repository I want to make into a remote repository

Here’s our local repository:

local $ git init .
local $ git add .
local $ git commit . -m "- initial commit"

Nice. Now make an empty repo on the remote server:

Here are some notes I keep for myself when I play with iptables (I don’t use it often enough to remember how it works):

List all rules

# iptables -L

See the rules and their numbers

# service iptables status

Delete a rule

# iptables -D CHAIN NUM

E.g.:

# iptables -D INPUT 12

Add a new rule at the bottom of the chain

# iptables -A INPUT -i eth0 -p tcp --dport 8888 -j ACCEPT

Insert a new rule in a particular place

This inserts a rule in position 6; the rule that was formerly in 6th position will be bumped down (and all rules below it):